Now showing items 20-39 of 5118

    • A 2-D simulation study on CO2ᅠsoluble surfactant for foam enhanced oil recovery 

      Zeng, Yongchao; Farajzadeh, Rouhi; Biswal, Sibani L.; Hirasaki, George J. (2019)
      This paper probes the transport of CO2ᅠsoluble surfactant for foaming in porous media. We numerically investigate the effect of surfactant partitioning between the aqueous phase and the gaseous phase on foam transport for subsurface applications when the surfactant is injected in the CO2ᅠphase. A 2-D reservoir simulation is developed to quantify the ...
    • A 3D printable perfused hydrogel vascular model to assay ultrasound-induced permeability 

      Royse, Madison K.; Means, A. Kristen; Calderon, Gisele A.; Kinstlinger, Ian S.; He, Yufang; (2022)
      The development of an in vitro model to study vascular permeability is vital for clinical applications such as the targeted delivery of therapeutics. This work demonstrates the use of a perfusion-based 3D printable hydrogel vascular model as an assessment for endothelial permeability and its barrier function. Aside from providing a platform that more ...
    • A 5-km-thick reservoir with > 380,000 km3 of magma within the ancient Earth's crust 

      Latypov, Rais; Chistyakova, Sofya; Hornsey, Richard A.; Costin, Gelu; van der Merwe, Mauritz (2022)
      Several recent studies have argued that large, long-lived and molten magma chambers may not occur in the shallow Earth’s crust. Here we present, however, field-based observations from the Bushveld Complex that provide evidence to the contrary. In the eastern part of the complex, the magmatic layering continuously drapes across a ~ 4-km-high sloping ...
    • A Ball and Beam Module for a Haptic Paddle Education Platform 

      Rose, Chad G.; Bucki, Nathan; O’Malley, Marcia K. (2017)
      Single degree of freedom force-feedback mechatronic devices, often called haptic paddles, are used in university curriculum as well as massive open online courses (MOOCs). While devices differ based on the goals of a given course, broadly speaking they provide hands-on learning for students studying mechatronics and dynamics. We introduce the third ...
    • A Bayesian Integrative Model for Genetical Genomics with Spatially Informed Variable Selection 

      Cassese, Alberto; Guindani, Michele; Vannucci, Marina (2014)
      We consider a Bayesian hierarchical model for the integration of gene expression levels with comparative genomic hybridization (CGH) array measurements collected on the same subjects. The approach defines a measurement error model that relates the gene expression levels to latent copy number states. In turn, the latent states are related to the ...
    • A Bayesian Nonparametric Spiked Process Prior for Dynamic Model Selection 

      Cassese, Alberto; Zhu, Weixuan; Guindani, Michele; Vannucci, Marina (2019)
      In many applications, investigators monitor processes that vary in space and time, with the goal of identifying temporally persistent and spatially localized departures from a baseline or “normal” behavior. In this manuscript, we consider the monitoring of pneumonia and influenza (P&I) mortality, to detect influenza outbreaks in the continental United ...
    • A Branch Decomposition Algorithm for the p-Median Problem 

      Fast, Caleb C.; Hicks, Illya V. (2017)
      In this paper, we use a branch decomposition technique to improve approximations to the p-median problem. Starting from a support graph produced either by a combination of heuristics or by linear programming, we use dynamic programming guided by a branch decomposition of that support graph to find the best p-median solution on the support graph. Our ...
    • A Burrowing/Tunneling Assay for Detection of Hypoxia in Drosophila melanogaster Larvae 

      Qiang, Karen M.; Zhou, Fanli; Beckingham, Kathleen M. (2018)
      Oxygen deprivation in animals can result from exposure to low atmospheric oxygen levels or from internal tissue damage that interferes with oxygen distribution. It is also possible that aberrant behavior of oxygen-sensing neurons could induce hypoxia-like behavior in the presence of normal oxygen levels. In D. melanogaster, development at low oxygen ...
    • A cable-based series elastic actuator with conduit sensor for wearable exoskeletons 

      Blumenschein, Laura H.; McDonald, Craig G.; O’Malley, Marcia K. (2017)
      There is currently a scarcity of wearable robotic devices that can practically provide physical assistance in a range of real world activities. Soft wearable exoskeletons, or exosuits, have the potential to be more portable and less restrictive than their rigid counterparts. In this paper, we present the design of an actuation system that has been ...
    • A century of Gestalt psychology in visual perception: II. Conceptual and theoretical foundations 

      Wagemans, Johan; Feldman, Jacob; Gepshtein, Sergei; Kimchi, Ruth; Pomerantz, James R.; (2012)
      Our first review article (Wagemans et al., 2012) on the occasion of the centennial anniversary of Gestalt psychology focused on perceptual grouping and figure-ground organization. It concluded that further progress requires a reconsideration of the conceptual and theoretical foundations of the Gestalt approach, which is provided here. In particular, ...
    • A Characterization of the DNA Data Storage Channel 

      Heckel, Reinhard; Mikutis, Gediminas; Grass, Robert N. (2019)
      Owing to its longevity and enormous information density, DNA, the molecule encoding biological information, has emerged as a promising archival storage medium. However, due to technological constraints, data can only be written onto many short DNA molecules that are stored in an unordered way, and can only be read by sampling from this DNA pool. ...
    • A Choose-Your-Own-Adventure-Style Virtual Lab Activity 

      Warning, Lauren A.; Kobylianskii, Krista (2021)
      Especially in the wake of the recent COVID-19 pandemic, which has caused universities across the globe to suspend in-person classes, online alternatives for laboratory activities are needed. Here, we report a choose-your-own-adventure (CYOA)-style activity, in which undergraduate general chemistry students influence the observed outcome of a prerecorded ...
    • A Chromosome-Length Assembly of the Hawaiian Monk Seal (Neomonachus schauinslandi): A History of “Genetic Purging” and Genomic Stability 

      Mohr, David W.; Gaughran, Stephen J.; Paschall, Justin; Naguib, Ahmed; Pang, Andy Wing Chun; (2022)
      The Hawaiian monk seal (HMS) is the single extant species of tropical earless seals of the genus Neomonachus. The species survived a severe bottleneck in the late 19th century and experienced subsequent population declines until becoming the subject of a NOAA-led species recovery effort beginning in 1976 when the population was fewer than 1000 animals. ...
    • A Chromosome-Length Reference Genome for the Endangered Pacific Pocket Mouse Reveals Recent Inbreeding in a Historically Large Population 

      Wilder, Aryn P; Dudchenko, Olga; Curry, Caitlin; Korody, Marisa; Turbek, Sheela P; (2022)
      High-quality reference genomes are fundamental tools for understanding population history, and can provide estimates of genetic and demographic parameters relevant to the conservation of biodiversity. The federally endangered Pacific pocket mouse (PPM), which persists in three small, isolated populations in southern California, is a promising model ...
    • A Closed-Form Technique for the Reliability and Risk Assessment of Wind Turbine Systems 

      (2012)
      This paper proposes a closed-form method to evaluate wind turbine system reliability and associated failure consequences. Monte Carlo simulation, a widely used approach for system reliability assessment, usually requires large numbers of computational experiments, while existing analytical methods are limited to simple system event configurations ...
    • A collagen glucosyltransferase drives lung adenocarcinoma progression in mice 

      Guo, Hou-Fu; Bota-Rabassedas, Neus; Terajima, Masahiko; Leticia Rodriguez, B.; Gibbons, Don L.; (2021)
      Cancer cells are a major source of enzymes that modify collagen to create a stiff, fibrotic tumor stroma. High collagen lysyl hydroxylase 2 (LH2) expression promotes metastasis and is correlated with shorter survival in lung adenocarcinoma (LUAD) and other tumor types. LH2 hydroxylates lysine (Lys) residues on fibrillar collagen’s amino- and ...
    • A common tattoo chemical for energy storage: henna plant-derived naphthoquinone dimer as a green and sustainable cathode material for Li-ion batteries 

      Miroshnikov, Mikhail; Kato, Keiko; Babu, Ganguli; Divya, Kizhmuri P.; Arava, Leela Mohana Reddy; (2018)
      The burgeoning energy demands of an increasingly eco-conscious population have spurred the need for sustainable energy storage devices, and have called into question the viability of the popular lithium ion battery. A series of natural polyaromatic compounds have previously displayed the capability to bind lithium via polar oxygen-containing functional ...
    • A Comprehensive Set of Impact Data for Common Aerospace Metals 

      Brake, M.R.W.; Reu, P.L.; Aragon, D.S. (2017)
      The results of two sets of impact experiments are reported within. To assist with model development using the impact data reported, the materials are mechanically characterized using a series of standard experiments. The first set of impact data comes from a series of coefficient of restitution (COR) experiments, in which a 2 m long pendulum is used ...
    • A computational framework for simultaneous estimation of muscle and joint contact forces and body motion using optimization and surrogate modeling 

      Eskinazi, Ilan; Fregly, Benjamin J. (2018)
      Concurrent estimation of muscle activations, joint contact forces, and joint kinematics by means of gradient-based optimization of musculoskeletal models is hindered by computationally expensive and non-smooth joint contact and muscle wrapping algorithms. We present a framework that simultaneously speeds up computation and removes sources of ...
    • A consistency analysis of phase-locked-loop testing and control-based continuation for a geometrically nonlinear frictional system 

      Abeloos, G.; Müller, F.; Ferhatoglu, E.; Scheel, M.; Collette, C.; (2022)
      Two of the most popular vibration testing methods for nonlinear structures are control-based continuation and phase-locked-loop testing. In this paper, they are directly compared on the same benchmark system, for the first time, to demonstrate their general capabilities and to discuss practical implementation aspects. The considered system, which is ...